private ObservableCollection <WarehouseLocation> BuildWarehouseLocationDropDown() { List <WarehouseLocation> list = new List <WarehouseLocation>(); list = _serviceAgent.GetWarehouseLocationsReadOnly(ClientSessionSingleton.Instance.CompanyID).ToList(); list.Add(new WarehouseLocation()); list.Sort((x, y) => string.Compare(x.Name, y.Name)); return(new ObservableCollection <WarehouseLocation>(list)); }